JPS6057007A - Gas distributor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a gas distribution device for use in an expanding flow path such as a tiffuser type vessel, for example, a flow path for guiding gas in an electrostatic precipitator. Gas distribution system consisting of a perforated maple plate and its support and connection structure pertains to a ship.

If the gas flow is to be uniformly distributed in a channel whose cross section is gradually enlarged, it is necessary to provide a distribution device when the diffusion angle exceeds a certain lower limit. For example, a distribution device of this kind is particularly necessary when a cross-sectional enlargement ratio of up to 1:15 is required. Gas distribution devices are usually perforated metal plates,
That is, the metal wall is made up of a large number of face members punched and/or bent so that the gas flow permeable portion and the gas flow blocking portion have a predetermined area ratio. The perforated metal plate is oriented substantially perpendicular to the gas flow and is divided into a number of sections if the flow path is relatively large. In this case, each perforated metal plate is fixedly attached to the respective support structure by means of a connecting member.

The opposing sides are bent into an L-shape, and the remaining two sides are bent into a substantially U-shape. The support member has a cross section rolled into a 1-shape or a substantially U-shape, and the perforated metal plate and the rolled surface are connected by a member E that can be simply inserted (Patented by the Federal Republic of Germany). No. 2719676 details@).

Problem to be Solved by the Invention In the case of this known waste distribution device, the velocity distribution in the cross section I is disturbed relatively strongly by the support member.

Therefore, the separation ability of the electrostatic separator is reduced. In particular, in the case where a plurality of gas distribution devices of this type of glue, together with their supporting parts, must be sequentially arranged along one direction of gas flow, the relative standard deviation S defined by the following equation 8 becomes large.

Where, vm: Average gas velocity in one measurement cross section vi: Local gas velocity in the same area part in one measurement horizontal plane n: Number of the same area part measured t'' Therefore, the relative standard deviation is reduced. The maximum standard deviation is 2.
The challenge is to improve gas distribution devices of the type described above to have smaller cores than 5% (more preferably 15%). This objective must be achieved without incurring increased assembly costs or requiring more or more complex structural components than in known gas distribution devices.

Further improvements should be made regarding assembly costs and manufacturing costs.

Rounding Means to Solve the Problem The above object can be solved by the present invention as follows. That is, the present invention provides the gas distribution device described at the beginning by bending all the square parts of the perforated metal plate into an abbreviated shape, and constructing each support structure from two flat strips. connected to each other at intervals by spacers,
There is a method in which the bent edges of the perforated metal plates are inserted between the flat strips and fixed by a connecting member, and the connecting member receives the spacer.

Operation: This arrangement makes the velocity of the gas uniform in the cross section.

Actual power = 1 In a model experiment in which three perforated metal plates were sequentially arranged in which the area ratio of the gas permeable part gradually decreased to 58%, 46%, and 40%, the relative standard deviation of 7cA-D was calculated by changing the arrangement mode. I met.

For all selected configurations A and D, the axial standard deviations are clearly reduced. What should be emphasized here is that the selection of the arrangement style was based on criteria unrelated to the technical idea of the present invention. In other words, the relative standard deviation is improved in all other configurations under different conditions. This means that a more uniform velocity is obtained over the entire gas flow cross section and a better separation can be achieved without changing other conditions.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a conventional gas distribution wall as described in German Patent No. 2,719,676.

The vertically arranged support slot 5 extends approximately 80 m from the gas flow tooth flank.
It consists of an engineered member with an end face that accounts for ~10%. Such a reduction in the gas flow cross-sectional area in itself causes few disadvantages. This is because a similar reduction occurs due to the perforated metal plate l, and if necessary, the reduction due to the support member i can be compensated for by changing the aperture ratio of this perforated metal plate.

A problem with known gas distribution devices is that the support member f creates a flow dead zone. Such dead zones disrupt the uniform gas velocity over the entire cross-section, resulting in a relatively large standard deviation.

In contrast, the support structure according to one embodiment of the invention shown in FIG. 1 is "permeable" to gas flow. This is because the flat strips 2 are only connected to each other at intervals by spacers 3 made of rectangular parallelepiped blocks welded to the flat strips 2, and r1+'f
This is because the connecting member 4 (see FIG. 3), which is a knee-shaped member, also has a flow cross-sectional area between the flat strips 2 which is only a fraction of its total height. The vertically bent green part of the perforated metal plate 1 is inserted between the flat plate strips 2 and is fixed by means of connecting members 4 more easily and inexpensively than in the case of the gas distribution wall of FIG. .

Figure 3a is a vertical sectional view and Figure 3b is a horizontal sectional view.
As shown in the figure, a perforated metal plate 1 is fixed to a support structure consisting of flat plate strips 2 and spacers 3 by means of a connecting member 4. As shown in FIG. 3a, the coupling member 4 is provided with a recess in the longitudinal web of the r-shaped member in which the spacer 31 is accommodated, so as to grip this spacer 3 in the assembled state. In some cases, the coupling member 4 is locked by the locking pin 6. Of course, it is also possible to secure the connecting member 4 by other means (for example spot welding). As shown in FIG. 3b, the perforated metal plate 1
is pressed against the half-plate strut 2 through the connecting member 4, and the bent edge t'L7 of the metal plate (the edges are spaced apart from each other).Thus, the perforated metal plate 1 , is identified three-dimensionally in two mutually perpendicular planes.The vertical support of the perforated metal plate 1 is achieved by bending the metal plate horizontally and twisting its edges together. In this case, it is preferable to arrange the contact surface of the edge at approximately the center of the vertical length of the coupling member 4, as shown by the horizontal break in FIG. 3a. .

Effects of the Invention The gas distribution device according to the present invention has a support structure that supports gas flow 1.
Since the wide end face in this perpendicular cross section is not cut, a more uniform distribution of gas velocity can be achieved compared to the structure described in German Patent No. 2719676. However, it has the advantage that manufacturing and assembly costs are lower. In addition, appropriate selection of the thick end face of the flat strip, the annular shape of the spacer, and the height and width of the end face of the connecting member will ensure that the opening ratio of the supporting and connecting structure of the gas distribution device is satisfied. The aperture ratio can be qualitatively the same as the aperture ratio of the hole metal plate.

[Brief explanation of drawings]

FIG. 1 is a horizontal partial sectional view of a conventional gas distribution wall as shown in German Patent No. 2,719,676. FIG. 2 is a horizontal partial sectional view of a gas distribution wall according to an embodiment of the present invention, FIG. 3a is a vertical partial clear view of the same, and FIG. 3b is a horizontal partial sectional view of a different part from FIG. 2 of the same. Illustrated. In addition, in the symbols used in the drawings, 1 .........Perforated metal plate 2 ・
・・・・・・・・・・・・・・・Flat strip 3...
・・・・・・・・・・・・Spacer 4 ・・・・・・・・・
・・・・・・・・・It is covered with a connecting member. Agent Masaru Ueya Yoshio TsuneFig, 1 5 F'+g, 2

Claims (1)

[Scope of Claims] 1. A gas distribution device used in a flow path t expanding into a diffuser shape, the gas distribution device t consisting of a perforated metal plate and its support and connection structure, all the edges of the perforated metal plates are bent in an oval shape, and each support structure consists of two flat strips, which are joined by spacers E at a distance of l, The bent edge of the perforated metal plate is inserted between the flat strips and fixed by a coupling member, and the coupling member is configured to receive the spacer. Gas distribution equipment. 2. The gas distribution device according to claim 1f, wherein the spacer is a rectangular parallelepiped block welded to a flat strip. Claim 1, characterized in that the 3% coupling member is constituted by a T-shaped member, the longitudinal web of which is provided with a recess for receiving a spacer, or Gas distribution device according to clause 2. 4. The gas according to any one of claims 1 to 3, characterized in that the support and coupling structure portion has substantially the same aperture ratio as the perforated metal plate. distribution device.